<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>练习5：DOM操作</title>
		<style type="text/css">
			html,div,ul,li {margin: 0px;padding: 0px;}
			a{cursor: pointer;}
			li {list-style: none;cursor: pointer;}
			fieldset {border: #000 1px dashed;width: 225px;height: 225px;padding: 10px;text-align: center;float: left;margin-left: 5px;}
			#cont_left {width: 300px;height: 500px;float: left;}
			#cont_right {float: left;}
			.newcss1{background-color: yellowgreen;}
		</style>
	</head>
	<body>
		<div id="cont_left">
			<ul><img src="img/fold.gif"><a onclick="show('menu1')"> 通过DOM获取信息 </a>
				<ul id="menu1">
					<li onclick="showImg()"><img src="img/doc.gif">获取原始图片路径</li>
					<li onclick="getFruit()"><img src="img/doc.gif">获取我喜欢的水果</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu2')"> 通过DOM操作元素 </a>
				<ul id="menu2">
					<li onclick="createImg()"><img src="img/doc.gif">创建图片</li>
					<li onclick="cloneImg()"><img src="img/doc.gif">克隆图片</li>
					<li onclick="changeImg()"><img src="img/doc.gif">改变图片</li>
					<li onclick="removeImg()"><img src="img/doc.gif">删除图片</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu3')"> 通过DOM操作样式 </a>
				<ul id="menu3">
					<li onclick="changeCss1()"><img src="img/doc.gif">为原始图片加上行间样式</li>
					<li onclick="changeCss2()"><img src="img/doc.gif">为所有的fieldset加上内部样式</li>
				</ul>
			</ul>

		</div>
		<fieldset>
			<legend>原始图片</legend>
			<img id="fruit" src="img/fruit.jpg">
		</fieldset>
		<fieldset>
			<legend>图片路径</legend>
			<p id="msg1">在这里显示</p>
		</fieldset>
		<fieldset>
			<legend>选择你喜欢的水果</legend>
			<ul style="text-align: left;">
				<li>
					<input name="enjoy" type="checkbox" value="苹果" />苹果
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="香蕉" checked="checked" />香蕉
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="葡萄" />葡萄
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="梨" checked="checked" />梨
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="西瓜" />西瓜
				</li>
			</ul>
			<div id="msg2" style="margin-top: 10px;text-align: left;"></div>
		</fieldset>
		<fieldset>
			<legend>创建图片</legend>
			<div id="msg3"></div>
		</fieldset>
		<fieldset>
			<legend>克隆图片</legend>
			<div id="msg4"></div>
		</fieldset>
		<script>
			//菜单收缩与扩展
			function show(title) {
                var menus = document.querySelectorAll('#cont_left ul ul');  
                menus.forEach(function(menu) {  
                menu.style.display = 'none';  
            });  
            var currentMenu = document.getElementById(title);  
            currentMenu.style.display = 'block';
			}
			//获取原始图片路径
			function showImg() {
                function showImg() {
                    var fruitImg = document.getElementById('fruit');  
                    var imagePath = fruitImg.src;                    
                    var msg1 = document.getElementById('msg1');   
                    msg1.textContent = 'task\zuoye5\img\fruit.jpg' + imagePath;  
                }
            }
            //获取喜欢的水果
            function getFruit() {
                let enjoy = document.getElementsByName('enjoy');
                    document.getElementById('msg2').innerHTML = "你最喜欢的水果是：";
                    for (var i = 0; i <= enjoy.length; i++) {
                        if (enjoy[i].checked == true) {
                            document.getElementById('msg2').innerHTML += enjoy[i].value + " ";
                        }
                    }
            }
            //创建图片
            function createImg() {
                var msg3 = document.getElementById('msg3'); 
                    var img = document.createElement('img');
                    img.src = "img/grape.jpg"; 
                    msg3.appendChild(img); 
            }
            //克隆图片
            function cloneImg() {
                var msg4 = document.getElementById('msg4');
                var cloneimg = document.getElementById('fruit'); 
                    msg4.appendChild(cloneimg.cloneNode()); 
            }
            //改变图片
            function changeImg() {
                var msg5 = document.getElementById('fruit');
                    msg5.src = "img/grape.jpg";
            }
            //删除图片
            function removeImg() {
                var msg6 = document.getElementById('fruit');
                    msg6.parentNode.removeChild(msg6);
            }
            //操作样式1
            function changeCss1(){
                    var cz = document.getElementById('fruit');
                    cz.style.border = 'solid 3px red';
            }
            //操作样式2
            function changeCss2(){
                var ys = document.getElementsByTagName('fieldset');
                    for (var i = 0; i < ys.length; i++) {
                        ys[i].style.backgroundColor = "green"
                    }
            }
        
		</script>
	</body>
</html>
